/********************************** (C) COPYRIGHT *******************************
 * File Name          : main.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : Main program body.
 *********************************************************************************
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * Attention: This software (modified or not) and binary are used for 
 * microcontroller manufactured by Nanjing Qinheng Microelectronics.
 *******************************************************************************/

/*
 *@Note
 *CRC error check and master/slave mode transceiver routine:
 *Master:SPI1_SCK(PA5)\SPI1_MOSI(PA7).
 *Slave:SPI1_SCK(PA5)\SPI1_MISO(PA6).
 *
 *This example demonstrates the use of CRC error checking, the Master sends 
 *and the Slave receives.
 *Note: The two boards download the Master and Slave programs respectively, 
 *and power on at the same time.
 *     Hardware connection:PA5--PA5
 *	           PA7--PA6
 *
 */

#include "debug.h"

/* SPI Mode Definition */
#define HOST_MODE   0
#define SLAVE_MODE   1

/* SPI Communication Mode Selection */
#define SPI_MODE   HOST_MODE
//#define SPI_MODE   SLAVE_MODE

/* Global define */
#define Size 4

/* Global Variable */
u8 TxData[Size] = { 0x01, 0x02, 0x03, 0x04};
u8 RxData[Size];

/*********************************************************************
 * @fn      SPI_1Lines_HalfDuplex_Init
 *
 * @brief   Configuring the SPI for half-duplex communication.
 *
 * @return  none
 */
void SPI_1Lines_HalfDuplex_Init( void )
{
    GPIO_InitTypeDef GPIO_InitStructure = {0};
    SPI_InitTypeDef SPI_InitStructure = {0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE );

#if (SPI_MODE == HOST_MODE)
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

#elif (SPI_MODE == SLAVE_MODE)
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init( GPIOA, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init( GPIOA, &GPIO_InitStructure );
#endif


#if (SPI_MODE == HOST_MODE)
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

#elif (SPI_MODE == SLAVE_MODE)
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

#endif

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init( SPI1, &SPI_InitStructure );

    SPI_CalculateCRC( SPI1, ENABLE );
    SPI_Cmd( SPI1, ENABLE );
}

/*********************************************************************
 * @fn      main
 *
 * @brief   Main program.
 *
 * @return  none
 */
int main( void )
{
    u8 i = 0, crcval;

    NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );
    SystemCoreClockUpdate();
    Delay_Init();
    USART_Printf_Init( 115200 );
    printf( "SystemClk:%d\r\n", SystemCoreClock );
    printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );

#if (SPI_MODE == SLAVE_MODE)
    printf( "SLAVE Mode\r\n" );
    Delay_Ms( 1000 );

#endif
    SPI_1Lines_HalfDuplex_Init();

#if (SPI_MODE == HOST_MODE)
    printf( "HOST Mode\r\n" );
    Delay_Ms( 2000 );

#endif

    while( 1 )
    {
#if (SPI_MODE == HOST_MODE)
        while( i < 3 )
        {
            if( i < 2 )
            {
                if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
                {
                    SPI_I2S_SendData( SPI1, TxData[i] );
                    i++;
                }
            }
            else
            {
                if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
                {
                    SPI_I2S_SendData( SPI1, TxData[i] );
                    SPI_TransmitCRC( SPI1 );
                    i++;
                }
            }
        }

        while( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
        {
            if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_BSY ) == RESET )
            {
                SPI_Cmd( SPI1, DISABLE );
                crcval = SPI_GetCRC( SPI1, SPI_CRC_Tx );
                printf( "CRC:%02x\r\n", crcval );
                while( 1 );
            }
        }

#elif (SPI_MODE == SLAVE_MODE)
        while( i < 4 )
        {

            if( i < 2 )
            {
                if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) != RESET )
                {
                    RxData[i] = SPI_I2S_ReceiveData( SPI1 );
                    i++;
                }
            }
            else if( i == 2 )
            {
                SPI_TransmitCRC( SPI1 );
                if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) != RESET )
                {
                    RxData[i] = SPI_I2S_ReceiveData( SPI1 );
                    i++;
                }
            }
            else
            {
                if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) != RESET )
                {
                    RxData[i] = SPI_I2S_ReceiveData( SPI1 );
                    i++;
                }
            }
        }

        crcval = SPI_GetCRC( SPI1, SPI_CRC_Rx );
        printf( "CRC:%02x\r\n", crcval );

        for( i = 0; i < 4; i++ ){
            printf( "Rxdata:%02x\r\n", RxData[i] );
        }

        while( 1 );

#endif
    }
}

